package com.example.server.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

@RestController
public class CaptchaController {  
    @Autowired
    private DefaultKaptcha defaultKaptcha;
    @ApiOperation(value = "验证码")
    @GetMapping("/captcha")
    public void captcha(HttpServletRequest request, HttpServletResponse response) {
        // 定义response输出类型为image/jpeg类型  
        response.setDateHeader("Expires", 0);  
        // Set standard HTTP/1.1 no-cache headers.  
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).  
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
        // Set standard HTTP/1.0 no-cache header.  
        response.setHeader("Pragma", "no-cache");  
        // return a jpeg  
        response.setContentType("image/jpeg");  
        //-------------------生成验证码 begin --------------------------  
        //获取验证码文本内容  
        String text = defaultKaptcha.createText();  
        System.out.println("验证码内容：" + text);  
        //将验证码放入session中  
        request.getSession().setAttribute("captcha", text);  
        //根据文本内容创建图形验证码  
        BufferedImage image = defaultKaptcha.createImage(text);
        ServletOutputStream outputStream = null;
        try {      
            outputStream = response.getOutputStream();      
            //输出流输出图片，格式jpg      
            ImageIO.write(image, "jpg", outputStream);
            outputStream.flush();  
        } catch (IOException e) {
            e.printStackTrace();  
        } finally {     
            if (null != outputStream) {   
                try {        
                    outputStream.close();  
                } catch (IOException e) {  
                    e.printStackTrace();     
                }  
            }  
        }   
    }
}